Novel method for location of internal faults in ungrounded double wye shunt capacitor banks

Pavan, PS and Das, S (2021) Novel method for location of internal faults in ungrounded double wye shunt capacitor banks. In: IEEE Transactions on Power Delivery, 36 (2). pp. 899-908.

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Abstract

Double wye shunt capacitor banks (SCB) are commonly used for reactive power support in high voltage transmission systems. Neutral current unbalance method is often used for protecting double wye SCBs against internal faults. One of the limitations of existing neutral current based unbalance methods is that they fail to detect simultaneous faults (same fault starting time or faults happening between two consecutive protection passes). This paper proposes a novel method for internal fault location in ungrounded double wye fused/fuseless SCBs. The proposed method uses compensated negative sequence and neutral currents to locate the internal faults. The advantage of the proposed method is that it can locate simultaneous faults happening in any of the two legs of SCB. The proposed method can also calculate the number of faulty elements. The performance of the proposed algorithm has been validated using both hardware experiments and software simulations. A laboratory scale prototype of ungrounded double wye SCB has been developed to test the performance of the proposed method. Software simulations have been done using PSCAD software. Results show that the proposed algorithm can locate both single and simultaneous faults even during system voltage unbalances. The proposed algorithm performs satisfactorily during load switching scenarios. © 1986-2012 IEEE.

Item Type:	Journal Article
Publication:	IEEE Transactions on Power Delivery
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Electric power transmission, Hardware experiment; High voltage transmissions; Negative sequence; Neutral currents; Reactive power support; Shunt capacitor banks; Simultaneous faults; Software simulation, Electric fault currents
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	19 Jul 2021 09:26
Last Modified:	19 Jul 2021 09:26
URI:	http://eprints.iisc.ac.in/id/eprint/68713

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